import 'package:demoflutterapp/pages/home_page.dart';
import 'package:demoflutterapp/pages/my_page.dart';
import 'package:demoflutterapp/pages/search_page.dart';
import 'package:demoflutterapp/pages/travel_page.dart';
import 'package:flutter/material.dart';

class TabNavigator extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    // TODO: implement createState
    return _TabNavigatorState();
  }
}

class _TabNavigatorState extends State<TabNavigator> {
  final _defaultColor = Colors.grey;
  final _activeColor = Colors.blue;
  var _currentIndex = 0;

  final PageController _controller = PageController(
    initialPage: 0,
  );

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: PageView(
        controller: _controller,
        children: <Widget>[
          HomePage(),
          SearchPage(),
          TravelPage(),
          MyPage(),
        ],
      ),
      bottomNavigationBar: BottomNavigationBar(
          currentIndex: _currentIndex,
          type: BottomNavigationBarType.fixed,
          onTap:(index) {
            _controller.jumpToPage(index);
            setState(() {
              _currentIndex=index;
            });
          },
          items: [
        BottomNavigationBarItem(
            icon: Icon(Icons.home, color: _defaultColor),
            activeIcon: Icon(Icons.home, color: _activeColor),
            title: Text(
              '首页',
              style: TextStyle(
                  color: _currentIndex == 0 ? _activeColor : _defaultColor),
            )),
        BottomNavigationBarItem(
            icon: Icon(Icons.search, color: _defaultColor),
            activeIcon: Icon(Icons.search, color: _activeColor),
            title: Text(
              '搜索',
              style: TextStyle(
                  color: _currentIndex == 1 ? _activeColor : _defaultColor),
            )),
        BottomNavigationBarItem(
            icon: Icon(Icons.camera_alt, color: _defaultColor),
            activeIcon: Icon(Icons.camera_alt, color: _activeColor),
            title: Text(
              '旅拍',
              style: TextStyle(
                  color: _currentIndex == 2 ? _activeColor : _defaultColor),
            )),
        BottomNavigationBarItem(
            icon: Icon(Icons.account_circle, color: _defaultColor),
            activeIcon: Icon(Icons.account_circle, color: _activeColor),
            title: Text(
              '我的',
              style: TextStyle(
                  color: _currentIndex == 3 ? _activeColor : _defaultColor),
            )),
      ]),
    );
  }
}
